diff --git a/autotests/read/pcx/16color.pcx b/autotests/read/pcx/16color.pcx
new file mode 100644
index 0000000..acd59cc
Binary files /dev/null and b/autotests/read/pcx/16color.pcx differ
diff --git a/autotests/read/pcx/16color.png b/autotests/read/pcx/16color.png
new file mode 100644
index 0000000..0c840bc
Binary files /dev/null and b/autotests/read/pcx/16color.png differ
diff --git a/src/imageformats/pcx.cpp b/src/imageformats/pcx.cpp
index c3ac535..a5d283d 100644
--- a/src/imageformats/pcx.cpp
+++ b/src/imageformats/pcx.cpp
@@ -308,6 +308,11 @@ static bool readImage4(QImage &img, QDataStream &s, const PCXHEADER &header)
         return false;
     }
 
+    if (header.BytesPerLine < (header.width() / 8)) {
+        qWarning() << "PCX image has invalid BytesPerLine value";
+        return false;
+    }
+
     for (int y = 0; y < header.height(); ++y) {
         if (s.atEnd()) {
             return false;